【摘要】 采用分块兰索斯法(BLOCK LANCZOS)计算了大跨度斜拉立体桁架的自振频率与振型,分析总结了该结构的自振特性的特点,探讨了跨度、塔高、塔柱的刚度、桁架高度、拉索的间距和拉索刚度以及屋面荷载等参数对结构自振频率的影响。计算表明,大跨度斜拉立体桁架结构体系频谱分布比较密集且具有较低的自振频率。文中得出的一些结论,对工程结构的设计与分析具有一定参考价值。更多还原

【Abstract】 The natural frequencies and shapes for a long span cable-stayed space truss are investigated by using block Lanczos method in this paper.The characteristics of natural frequency can be summarized.Finally,influences of some parameters,such as span,height of tower,rigidity of tower,height of space truss,space between cables,stiffness of cable and load of roofs,on frequency behavior of the space truss are studied.The results are shown that natural freguencies of the long span cable-stayed space truss are denser and lower.The conclusions have referential values for the application and research of the space truss.更多还原